with t as(
select 
    emp_no,
    birth_date,
    first_name,
    last_name,
    gender,
    hire_date,
    dense_rank() over(order by hire_date desc)as hire_rank
from employees)

select 
    emp_no,
    birth_date,
    first_name,
    last_name,
    gender,
    hire_date
from t
where hire_rank=3

rank()相同数值排序相同,跳过下一个序数;

dense_rank()相同数值排序相同,不跳过下一个序数。